CVE-2026-74719: Linux kernel · net/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 5.15.0-1117.124~20.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.15.0-1117.124~20.04.1, 5.15.0-1123.132~20.04.1, 5.15.0-1122.131~20.04.1 +26
Exploitation evidence
Disclosed: evidence found.
CVE published 22 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A patch is available and should be applied to affected Linux kernel versions to fix the memory leak issue. The vendor advisory confirms that the flaw has been resolved. Users should update their systems to the fixed kernel versions listed in the advisory. No additional mitigation actions are required beyond applying the official patch.
Description
A vulnerability in the Linux kernel's SMC (Shared Memory Communications) subsystem was fixed. The flaw involved improper handling of incoming qentry pointers in the smc_llc_event_handler() function, where duplicate CONFIRM_LINK or ADD_LINK_CONT requests could overwrite an existing qentry pointer without freeing the previous allocation, causing a memory leak. This issue was addressed by adding a guard to prevent overwriting when a qentry is already set. The vulnerability affects specific Linux kernel versions and has been patched.
References
- nvd.nist.gov/vuln/detail/CVE-2026-74719 (opens in a new tab)
- git.kernel.org/stable/c/06734dfeaeba886aab1bf147249195b888ac3e4d (opens in a new tab)
- git.kernel.org/stable/c/10cb31b2b74cb664c6c95cf72364d7d5c483ab82 (opens in a new tab)
- git.kernel.org/stable/c/976245094925bab9bc39366b2e9ab44ffcde61d0 (opens in a new tab)
- git.kernel.org/stable/c/a1e980d7a9e7ee6faf4f5fd7b450413b969af26d (opens in a new tab)
- git.kernel.org/stable/c/bfc336a9fbbf09805f3dfe25c195a4db90af2846 (opens in a new tab)
- git.kernel.org/stable/c/c23c409228629107203d3c3e95fff1473173f1a6 (opens in a new tab)
- git.kernel.org/stable/c/e0eb87677c76b157cdf8eb7c1f19e56227165a33 (opens in a new tab)
- git.kernel.org/stable/c/e384f3cba6ea709f5b2272b1770db4ce14047f78 (opens in a new tab)
- ubuntu.com/security/CVE-2026-74719 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-74719 (opens in a new tab)
- git.kernel.org/linus/976245094925bab9bc39366b2e9ab44ffcde61d0 (opens in a new tab)
- msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74719.json (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)
- ubuntu.com/security/notices/USN-8878-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8879-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8877-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8875-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8875-2 (opens in a new tab)